simichrome is a non abrasive metal polish that will brighten most metals without marking the surface. it was mentioned in a DGJ article several years ago. fellow had upgraded/restored a WR gun and the case colors came back too pronounced to let the engraving show to best advantage. he commented that judicious use of simichrome allowed a very controlled reduction in the colors. simichrome was once available in most motorcycle shops.

"it's a poor sort of memory that only works backwards."
lewis carroll, Alice in Wonderland